The short answer is that we might be able to make 450+hp with a V6 NA pump fuel. We would need pretty much a motor full of bespoke parts. The critical issue are the closed chamber heads and the valve size.... If we broke it we'd be back to square one.

There are SBC heads that flow that much off the shelf. There are pistons we can use, already made....we need a crank. Bottom line is 450+hp 250-258ci Small block chevys are not unheard of. Whereas a series 1 V6 of that kind of calibre aren't on every corner.

Fordboy did some sums on what we have currently and it won't turn fast enough for long enough......ultimately our money is better spent on an 8.

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Hot Rod magazine evaluates things occasionally at the Duttweiler facilities. They build up V-8 test mule motors for these evaluations and the engine specs are in the articles. These mule motor combinations of blocks, heads, cranks, etc look pretty good. Building a motor based on their test mule engine might be a good starting point. I saved an article just for this purpose. I will try to find it in my rat nest office. It is around here somewhere.

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing." Helen Keller

You're right Bill, but they still ain't as dirt common as the eights, and none of that stuff is here whereas we can get the block and heads fror all the late model V8's here easily....a V6 would be my pick if there was no difference because then I could focus all my energy on harassing Grumm to build it and barely have to lift a finger myself......

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As far as exactly how much power we need I can't put my grubbys on it right now but (now the Colonel will point out that the car was breaking down on the second run) our top speed was 215.041mph at 6400rpm with a 2.41 where the dyno told us we had 320+hp at the crank.

We also ran 1./205 with a 2.56:1@ 6400 2./205 with a 2.14:1@ 5300 where we know we had 270+hp at the crank.

Off the top of my head Sumner's spreadsheet told us we needed over 420hp to run 240mph.

The car can be cleaned up a little aero wise and we were rev limited by some mystery problem so the figure of 420 may be higher than reality, but enough power is never enough and I'm fairly certain it'll be able to put 450+hp down without too much trouble even without suspension.

Fire away Fordboy.

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"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing." Helen Keller

My part of this gig will be stretching the car about six years inches right behind the firewall.

I enjoy the enthusiastic simplification of adding 6" to your bellytank. The thought of doing that to mine makes me a little sick.

Hope it all goes well.

Andy

Hey Andy, doing it to your tank would be a little more , er challenging I think,

On our car the firewall is round about the transition point and thus we figure adding an extension.piece there will have the least effect on the aero efficiency of our shape. The other point is our car like every other Lakester is crammed full , the one part of the car that has a little daylight is between the front of he motor and the firewall, brake line, clutch line, throttle cable, wiring loom...they can all be easily extended AND have quick connect fittings so the car can be separated there. That will make working on it a lot easier...to change the diff ratio we have to hoist the motor at the moment.

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Sparky's logic is pretty good, as you are planning to lengthen the car and install a V8 why not make the V8 into a V6 with two "dead" holes. Keith Dorton at Automotive Specialties has done this to make a smaller displacement and has had good success. The big plus is that by adding a cylinder (V-7?) you would be in D class and going to a full V-8 would put you in C class. Plus you would not have to buy a $1000 2 -9/16 stroke billet crank.

Hmmm. Maybe I can guess what volunteer job you've been allowed to choose?

Slim, every meeting it's toilets this, and toilets that.I think we now have ten toilets on the lake and about six of them look like the've been there fro 25 years plusyep, it's a volunteer job, but not my job